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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
%% We use a gen_server simply so that during the terminate/2 call
%% (i.e., during shutdown), we can sync/flush the dets table to disk.
-module(rabbit_recovery_terms).
-behaviour(gen_server).
-export([start/1, stop/1, store/3, read/2, clear/1]).
-export([start_link/1]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([upgrade_recovery_terms/0, persistent_bytes/0]).
-export([open_global_table/0, close_global_table/0,
read_global/1, delete_global_table/0]).
-export([open_table/1, close_table/1]).
-rabbit_upgrade({upgrade_recovery_terms, local, []}).
-rabbit_upgrade({persistent_bytes, local, [upgrade_recovery_terms]}).
-include("rabbit.hrl").
%%----------------------------------------------------------------------------
-spec start(rabbit_types:vhost()) -> rabbit_types:ok_or_error(term()).
start(VHost) ->
case rabbit_vhost_sup_sup:get_vhost_sup(VHost) of
{ok, VHostSup} ->
{ok, _} = supervisor2:start_child(
VHostSup,
{?MODULE,
{?MODULE, start_link, [VHost]},
transient, ?WORKER_WAIT, worker,
[?MODULE]});
%% we can get here if a vhost is added and removed concurrently
%% e.g. some integration tests do it
{error, {no_such_vhost, VHost}} ->
rabbit_log:error("Failed to start a recovery terms manager for vhost ~s: vhost no longer exists!",
[VHost])
end,
ok.
-spec stop(rabbit_types:vhost()) -> rabbit_types:ok_or_error(term()).
stop(VHost) ->
case rabbit_vhost_sup_sup:get_vhost_sup(VHost) of
{ok, VHostSup} ->
case supervisor:terminate_child(VHostSup, ?MODULE) of
ok -> supervisor:delete_child(VHostSup, ?MODULE);
E -> E
end;
%% see start/1
{error, {no_such_vhost, VHost}} ->
rabbit_log:error("Failed to stop a recovery terms manager for vhost ~s: vhost no longer exists!",
[VHost]),
ok
end.
-spec store(rabbit_types:vhost(), file:filename(), term()) -> rabbit_types:ok_or_error(term()).
store(VHost, DirBaseName, Terms) ->
dets:insert(VHost, {DirBaseName, Terms}).
-spec read(rabbit_types:vhost(), file:filename()) -> rabbit_types:ok_or_error2(term(), not_found).
read(VHost, DirBaseName) ->
case dets:lookup(VHost, DirBaseName) of
[{_, Terms}] -> {ok, Terms};
_ -> {error, not_found}
end.
-spec clear(rabbit_types:vhost()) -> 'ok'.
clear(VHost) ->
try
dets:delete_all_objects(VHost)
%% see start/1
catch _:badarg ->
rabbit_log:error("Failed to clear recovery terms for vhost ~s: table no longer exists!",
[VHost]),
ok
end,
flush(VHost).
start_link(VHost) ->
gen_server:start_link(?MODULE, [VHost], []).
%%----------------------------------------------------------------------------
upgrade_recovery_terms() ->
open_global_table(),
try
QueuesDir = filename:join(rabbit_mnesia:dir(), "queues"),
Dirs = case rabbit_file:list_dir(QueuesDir) of
{ok, Entries} -> Entries;
{error, _} -> []
end,
[begin
File = filename:join([QueuesDir, Dir, "clean.dot"]),
case rabbit_file:read_term_file(File) of
{ok, Terms} -> ok = store_global_table(Dir, Terms);
{error, _} -> ok
end,
file:delete(File)
end || Dir <- Dirs],
ok
after
close_global_table()
end.
persistent_bytes() -> dets_upgrade(fun persistent_bytes/1).
persistent_bytes(Props) -> Props ++ [{persistent_bytes, 0}].
dets_upgrade(Fun)->
open_global_table(),
try
ok = dets:foldl(fun ({DirBaseName, Terms}, Acc) ->
store_global_table(DirBaseName, Fun(Terms)),
Acc
end, ok, ?MODULE),
ok
after
close_global_table()
end.
open_global_table() ->
File = filename:join(rabbit_mnesia:dir(), "recovery.dets"),
{ok, _} = dets:open_file(?MODULE, [{file, File},
{ram_file, true},
{auto_save, infinity}]),
ok.
close_global_table() ->
try
dets:sync(?MODULE),
dets:close(?MODULE)
%% see clear/1
catch _:badarg ->
rabbit_log:error("Failed to clear global recovery terms: table no longer exists!",
[]),
ok
end.
store_global_table(DirBaseName, Terms) ->
dets:insert(?MODULE, {DirBaseName, Terms}).
read_global(DirBaseName) ->
case dets:lookup(?MODULE, DirBaseName) of
[{_, Terms}] -> {ok, Terms};
_ -> {error, not_found}
end.
delete_global_table() ->
file:delete(filename:join(rabbit_mnesia:dir(), "recovery.dets")).
%%----------------------------------------------------------------------------
init([VHost]) ->
process_flag(trap_exit, true),
open_table(VHost),
{ok, VHost}.
handle_call(Msg, _, State) -> {stop, {unexpected_call, Msg}, State}.
handle_cast(Msg, State) -> {stop, {unexpected_cast, Msg}, State}.
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, VHost) ->
close_table(VHost).
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%----------------------------------------------------------------------------
-spec open_table(vhost:name()) -> rabbit_types:ok_or_error(any()).
open_table(VHost) ->
open_table(VHost, 10).
-spec open_table(vhost:name(), non_neg_integer()) -> rabbit_types:ok_or_error(any()).
open_table(VHost, RetriesLeft) ->
VHostDir = rabbit_vhost:msg_store_dir_path(VHost),
File = filename:join(VHostDir, "recovery.dets"),
Opts = [{file, File},
{ram_file, true},
{auto_save, infinity}],
case dets:open_file(VHost, Opts) of
{ok, _} -> ok;
{error, Error} ->
case RetriesLeft of
0 ->
{error, Error};
N when is_integer(N) ->
_ = file:delete(File),
%% Wait before retrying
DelayInMs = 1000,
rabbit_log:warning("Failed to open a recovery terms DETS file at ~p. Will delete it and retry in ~p ms (~p retries left)",
[File, DelayInMs, RetriesLeft]),
timer:sleep(DelayInMs),
open_table(VHost, RetriesLeft - 1)
end
end.
-spec flush(vhost:name()) -> rabbit_types:ok_or_error(any()).
flush(VHost) ->
try
dets:sync(VHost)
%% see clear/1
catch _:badarg ->
rabbit_log:error("Failed to sync recovery terms table for vhost ~s: the table no longer exists!",
[VHost]),
ok
end.
-spec close_table(vhost:name()) -> rabbit_types:ok_or_error(any()).
close_table(VHost) ->
try
ok = flush(VHost),
ok = dets:close(VHost)
%% see clear/1
catch _:badarg ->
rabbit_log:error("Failed to close recovery terms table for vhost ~s: the table no longer exists!",
[VHost]),
ok
end.
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